So my mom had to have a huge surgery 8 months ago and hasn't been able to go home and live with her cat (he is 1 year and 1 month old now) I have been feeding him and cleaning his litter box every day, he is an inside cat, recently he has started becoming very aggressive toward me, to the point where I have to fight to get out of the house, I can't take him home to live with me because my building doesn't allow cats and my mom will eventually be able to go home, my question is, how can I deal with his aggressive behaviour and keep him calm until she can return? Also, I am having him neutered tomorrow - will this help his behaviour?